[#2382] Let DAO reference a Configuration instead of an Executor

jOOQ/src/main/java/org/jooq/DAO.java

@@ -53,6 +53,14 @@ import org.jooq.exception.DataAccessException;
  */
 public interface DAO<R extends TableRecord<R>, P, T> {
 
+    /**
+     * Expose the configuration in whose context this <code>DAO</code> is
+     * operating.
+     *
+     * @return the <code>DAO</code>'s underlying <code>Configuration</code>
+     */
+    Configuration configuration();
+
     /**
      * Performs an <code>INSERT</code> statement for a given POJO
      *

jOOQ/src/main/java/org/jooq/impl/DAOImpl.java

@@ -80,12 +80,20 @@ public abstract class DAOImpl<R extends UpdatableRecord<R>, P, T> implements DAO
     }
 
     /**
-     * Inject an attached factory
+     * Inject a configuration.
+     * <p>
+     * This method is maintained to be able to configure a <code>DAO</code>
+     * using Spring. It is not exposed in the public API.
      */
     public final void setConfiguration(Configuration configuration) {
         this.configuration = configuration;
     }
 
+    @Override
+    public final Configuration configuration() {
+        return configuration;
+    }
+
     // -------------------------------------------------------------------------
     // XXX: DAO API
     // -------------------------------------------------------------------------